First Alert SC5 Hardwire Smart Smoke & CO Alarm vs Heiman HS1SA Series Smoke Alarm

Budget and hazard coverage pull in opposite directions here: the Heiman HS1SA Series Smoke Alarm comes out on top overall as the more affordable, better-rated pick that also connects to more smart-home platforms through its Zigbee radio, plus a built-in light the First Alert unit lacks. The First Alert SC5 Hardwire Smart Smoke & CO Alarm answers back with the more complete safety hardware: it detects carbon monoxide alongside smoke, sends a fuller set of alerts (fire, CO and low-battery, versus the Heiman's fire and low-battery only), and adds steam-check false-alarm filtering the Heiman does not offer. So the win here is about cost and ecosystem reach, not hazard coverage: the compact Heiman HS1SA is smoke-only and needs a Zigbee hub to unlock any smart features, while the SC5 Hardwire is a self-contained, mains-powered unit with a battery backup that needs no hub at all. Buyers who already run a Zigbee setup and only need discreet, affordable smoke detection should pick the Heiman HS1SA Series Smoke Alarm, while anyone wanting hardwired power and built-in carbon monoxide protection should choose the First Alert SC5 Hardwire Smart Smoke & CO Alarm.